Pneumatic-despatch-tube apparatus.



Patented Aug. 30, 1910.

. MEETS- SHEET 1.

o. R. LIBBY. PNEUMATIG DBSPATCH TUBE APPARATUS.

APPLICATION FILED MAIN, 1Q08.

G. R. LIBBY.

PNEUMATICI DESPATCH TUBE APPARATUS.

Patenta'Aug. so, 1'910.`

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AP'LIOATION FILED MAY 14, 1908.

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CHARLES R. LIIBBY, OF LGV/'ELI'. MASSACHUSETTS, ASSIGNOR TlO LAMSON CONSGLI- DATED STORE SERVICE COMPANY, OF NEVARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

PNEUMATIC-DESPATCH-TUBE APPARATUS.

Application filed May 14, 1908. Serial No. l132,810.

Lowell, in the county of Middlesex and State of lvlassachusetts, have invented certain new and usefulImprovements in Pneumatic-Despatch-Tube Apparatus, of which the following is a specication.

My invention relates to improvements in pneumatic despatch tube apparatus and particularly to the class known as the open cur.- rent or vacuum system and the object of this invention is to reduce thequantity of air normally liowing throughthe system to a mimimum When no carriers are in transit thereby economizing in the use of power.

Another' object of this invention is to provide means operative upon the despatching of a carrier to admit a maximiinia'mount ot' air for driving said carrier and for maintaining the flow of air until the carrier has delivered at its destination when the flow is automatically reduced to a minimum.

In the accompanying drawings is illustrated a construction embodying this invention in Whichz- Figure 1 is a diagram of a circuit-'ot pneumatic transmission tubes showing the controlling 4mechanism connected therewith and in normal position. Fig. 2 is an enlarged elevation, partly in section, of the controlling mechanism shown in Fig. 1. Fig. 3 is a similar View to Fig. 2 showing the parts in operatin position When a carrier is despatched. Fig. 4 is an enlarged section of one of the valves hereinafter described.

Lilre letters of reference refer to like parts throughout the several views.

Referring to Fig. 1, C represents a cashiers or central station which is connected b the transit tube 1 with the discharge terminal 2 controlled by the usual Valve 3 at the sales or sub-station S.

4 is a return tube connecting the terminal 2 with the discharge terminal 5 controlled by the delivery valve 6 at the central station C.

7 is a vacuum tube connecting the terminal 5 with the usual vacuum drum 8.

9 is-a bellmouth or despatching inlet for inserting carriers into the tube 1 and 10 is the usual despatching inlet located at the sub-station for inserting carriers into the tube 4.' lnterposed in the vacuum tube 7 is a casing 11 in which is pivoted the normally closed Valve 13 connected by a link 11i With the diaphragm 15. This diaphragm 15 is so mounted in the casing 11 that its inner face is constantly in communication'with the vacuum in the tube 7 below Valve 13, audits outer t'ace is inclosed by the cover 17 forming a chamber 16 which communicates With .said vacuum through a ny-pass 18 controlled by a tuning valve 19 which is held in adjust;

ment by a check nut 20.

21 is a port for .admitting air to the chamber 16 and normally closed by a valve 22.

25 is a stem centrally secured to the diaphragm 24 Which is mounted in the casing,l 23, said stem having secured thereto at one end the valve 22 and mounted over the other end the spring 27, one end of said spring acting against the collar 28 secured to said stein 25, the opposite end of said spring ccnfined by a movable collar 26 which is operated by the adjusting screw 29 to regulate the tension of said spring.

30 is a by-pass' connecting the vacuum tube 7 above the Valve 13 With the cha mber 31 on one side of diaphragm 24- and 32 is a continuation of said by-pass connecting said chamber 31 with the vacuum tube.7 below the valve 13 and which continuation is controlled by a Valve 33 to regulate the amount of air passing through said by-pass.

Connecting the chamber 35 on the opposite side ci diaphragm 2d with the tube 7 above the valve 13 is a tube 3l controlled by a valve 36 which is normally held in the position shown in Figs. 1 and l by a weight 37 and in which position the chamber 35 is cut off from communication with the tube 7 and air is admitted through a port 38. 39 is an arm secured at one end to the shaft or pivot 12 of valve 13 and pivoted at the opposite end to a link 4:0 in which is located a slot 41. y

l2 is an arm connected with valve 36 vand carries the stud or pin 4:3 mounted in the slot 4-1,

The operation ofthe apparatus is as tolraeeneen Ang. eo, aero;

naam@ Q Y 1f 1. A A l A translt tube for drxvng carriers, means for name to this speclcaton 1n the presence of tmung the closure of sind alf-valve to Ietwo subscrlblng wit-messes, thls second day store sind restrlcted How of au when sind of May A. 1),.1908.

carriers have been transmitted, @n means CHARLES R. LBBY. 5 for regulating the volume of said estrcted fitnesses:

flow of air. L. G. BARTLETT, In testimony whereof, I have signed my A. L. MESSER. 

